Electronic controller for fluid fuel burner

Details Electronic controller for fluid fuel burner Electronic controller for fluid fuel burner

F - Mech Eng,Light,Heat,Weapons

23

N

341/19

F23N 5/02 (2006.01) F23N 5/08 (2006.01) F23N 5/20 (2006.01)

Patent

CA 2000605

-20- ABSTRACT OF THE DISCLOSURE Electronic control system for an oil burner has a primary direct current power source controlled by a ther- mostat and a secondary direct current power source inde- pendent of the thermostat. A first relay is in circuit with the oil burner motor to energize the same and a second relay is in series with the first and with an alter- nating voltage source for energizing the ignitor of the furnace. An electronic circuit controls the first relay switch and includes a pair of silicon controlled recti- fiers (SCR's) connected in series for energizing the first relay. A second electronic circuit includes a pair of interconnected NPN transistors for controlling the opera- tion of the second relay switch. The first NPN transistor is conductive when the second relay switch is energized and the second NPN transistor is connected to the first to turn "OFF" the same in response to flame being sensed in the furnace. A flame sensing element in the furnace is associated with a control relay for controlling a pair of relay switches, one of which is in series with the SCR's and the other is adapted to energize a redundant pair of time-delay circuits. Each time-delay circuit includes a capacitor and a programmable unijunction transistor (PUT) -21- programmed to breakover at a voltage which is a function of a first predetermined time for charging a capacitor and a resistance in the cathode circuit of each PUT which pro- vides for a second predetermined time for the discharge of the capacitor voltage to hold the second relay "OPEN" by conduction through the second NPN transistor. Another electronic circuit includes an NPN transistor and PNP transistor connected to energize the first relay switch.

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